This ASP.NET MVC TreeView example demonstrates the drag and drop functionality of TreeView. A drag and drop image is present at the top of the sample which hides on clicking the sample. To drag and drop node, select and drag the desired node and drop it on the target node or external container.
The TreeView component allows users to drag any node and drop it on any other node in the same or different tree using allowDragAndDrop property. Additionally, it supports dropping a tree node to an external container using nodeDragStop event of the TreeView
For more information, you can refer to the Drag and Drop section from the documentation.